SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    1137, 1068, 1127, 1108, 1119, 1120, 1130, 
    1150, 1158, 1065, 1140, 1157, 1182, 
    1089, 1106, 1069, 1136, 1156, 1161, 
    1165
  )

Query time 0.00143

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "32.01"
    },
    "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": 60,
      "rows_produced_per_join": 60,
      "filtered": "100.00",
      "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_variation_group_products`.`group_id` in (1137,1068,1127,1108,1119,1120,1130,1150,1158,1065,1140,1157,1182,1089,1106,1069,1136,1156,1161,1165))",
      "cost_info": {
        "read_cost": "26.01",
        "eval_cost": "6.00",
        "prefix_cost": "32.01",
        "data_read_per_join": "960"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ]
    }
  }
}