SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  products.amount, 
  descr1.product as product, 
  companies.company as company_name, 
  variation_group_products.group_id AS variation_group_id, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'ru' 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  INNER JOIN cscart_product_variation_group_products AS variation_group_products ON variation_group_products.product_id = products.product_id 
WHERE 
  1 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND variation_group_products.group_id IN (39, 40, 132, 133) 
GROUP BY 
  products.product_id 
ORDER BY 
  NULL asc

Query time 0.00135

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "126.04"
    },
    "ordering_operation": {
      "using_filesort": false,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "variation_group_products",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "idx_group_id"
              ],
              "key": "idx_group_id",
              "used_key_parts": [
                "group_id"
              ],
              "key_length": "3",
              "rows_examined_per_scan": 27,
              "rows_produced_per_join": 27,
              "filtered": "100.00",
              "index_condition": "(`cscart`.`variation_group_products`.`group_id` in (39,40,132,133))",
              "cost_info": {
                "read_cost": "36.41",
                "eval_cost": "5.40",
                "prefix_cost": "41.81",
                "data_read_per_join": "432"
              },
              "used_columns": [
                "product_id",
                "group_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "cscart.variation_group_products.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 26,
              "filtered": "99.57",
              "cost_info": {
                "read_cost": "27.00",
                "eval_cost": "5.38",
                "prefix_cost": "74.21",
                "data_read_per_join": "176K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "amount",
                "usergroup_ids",
                "parent_product_id"
              ],
              "attached_condition": "(((`cscart`.`products`.`usergroup_ids` = '') or find_in_set(0,`cscart`.`products`.`usergroup_ids`) or find_in_set(1,`cscart`.`products`.`usergroup_ids`)) and (`cscart`.`products`.`status` = 'A'))"
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "cscart.products.company_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 2,
              "filtered": "10.00",
              "cost_info": {
                "read_cost": "26.88",
                "eval_cost": "0.54",
                "prefix_cost": "106.47",
                "data_read_per_join": "18K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`cscart`.`companies`.`status` = 'A')"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "pt",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "cscart.variation_group_products.product_id"
              ],
              "rows_examined_per_scan": 3,
              "rows_produced_per_join": 8,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "8.07",
                "eval_cost": "1.61",
                "prefix_cost": "116.15",
                "data_read_per_join": "129"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "cscart.products_categories.category_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "8.07",
                "eval_cost": "0.08",
                "prefix_cost": "125.83",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "(((`cscart`.`cscart_categories`.`usergroup_ids` = '') or find_in_set(0,`cscart`.`cscart_categories`.`usergroup_ids`) or find_in_set(1,`cscart`.`cscart_categories`.`usergroup_ids`)) and (`cscart`.`cscart_categories`.`status` in ('A','H')) and (`cscart`.`cscart_categories`.`storefront_id` in (0,1)))"
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "cscart.variation_group_products.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.13",
                "eval_cost": "0.08",
                "prefix_cost": "126.04",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          }
        ]
      }
    }
  }
}