SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    89, 527, 415, 202, 208, 819, 221, 229, 
    228, 246, 354, 433, 167, 505, 509, 372, 
    217, 219, 175, 471, 541, 642, 610, 289, 
    234, 284, 247, 249, 207, 235, 815, 195, 
    643, 646
  )

Query time 0.00132

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "63.41"
    },
    "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": 122,
      "rows_produced_per_join": 122,
      "filtered": "100.00",
      "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_variation_group_products`.`group_id` in (89,527,415,202,208,819,221,229,228,246,354,433,167,505,509,372,217,219,175,471,541,642,610,289,234,284,247,249,207,235,815,195,643,646))",
      "cost_info": {
        "read_cost": "51.21",
        "eval_cost": "12.20",
        "prefix_cost": "63.41",
        "data_read_per_join": "1K"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ]
    }
  }
}