SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    73, 63, 64, 62, 149, 98, 150, 543, 151, 
    157, 334, 338, 336, 333, 337, 335, 774, 
    901, 987, 915, 899, 900, 974
  )

Query time 0.00098

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.11"
    },
    "table": {
      "table_name": "cscart_product_variation_group_products",
      "access_type": "range",
      "possible_keys": [
        "idx_group_id"
      ],
      "key": "idx_group_id",
      "used_key_parts": [
        "group_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 83,
      "rows_produced_per_join": 83,
      "filtered": "100.00",
      "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_variation_group_products`.`group_id` in (73,63,64,62,149,98,150,543,151,157,334,338,336,333,337,335,774,901,987,915,899,900,974))",
      "cost_info": {
        "read_cost": "34.81",
        "eval_cost": "8.30",
        "prefix_cost": "43.11",
        "data_read_per_join": "1K"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ]
    }
  }
}