SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    1160, 1103, 1129, 1159, 1173, 1086, 1146, 
    1174, 1163, 1053, 1139, 1175, 1122, 
    1104, 1155, 1178, 1180, 1148, 1176
  )

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "31.76"
    },
    "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 (1160,1103,1129,1159,1173,1086,1146,1174,1163,1053,1139,1175,1122,1104,1155,1178,1180,1148,1176))",
      "cost_info": {
        "read_cost": "25.76",
        "eval_cost": "6.00",
        "prefix_cost": "31.76",
        "data_read_per_join": "960"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ]
    }
  }
}