SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    71, 72, 73, 54, 69, 68, 70, 131, 46, 119, 
    120, 25, 87, 84, 31, 90, 82, 86, 89, 85, 
    92, 88, 93, 91, 94, 83, 53, 26, 28, 29, 
    27, 79, 77, 112, 114, 115
  )

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "73.46"
    },
    "table": {
      "table_name": "cscart_product_variation_group_products",
      "access_type": "index",
      "possible_keys": [
        "idx_group_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "group_id"
      ],
      "key_length": "6",
      "rows_examined_per_scan": 353,
      "rows_produced_per_join": 116,
      "filtered": "32.86",
      "using_index": true,
      "cost_info": {
        "read_cost": "50.26",
        "eval_cost": "23.20",
        "prefix_cost": "73.46",
        "data_read_per_join": "1K"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ],
      "attached_condition": "(`cscart`.`cscart_product_variation_group_products`.`group_id` in (71,72,73,54,69,68,70,131,46,119,120,25,87,84,31,90,82,86,89,85,92,88,93,91,94,83,53,26,28,29,27,79,77,112,114,115))"
    }
  }
}