SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    620, 623, 260, 627, 608, 628, 410, 647, 
    559, 354, 433, 372, 642, 195, 646, 571, 
    306, 675, 305, 625, 409, 547, 261, 453, 
    562, 561, 556, 364, 363, 622, 621, 404, 
    282, 552, 661, 352, 564, 346, 345, 418, 
    252, 681, 155, 466, 666, 353, 381, 212, 
    266, 664, 383, 648, 432, 373, 382, 673, 
    689
  )

Query time 0.00121

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "108.76"
    },
    "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": 210,
      "rows_produced_per_join": 210,
      "filtered": "100.00",
      "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_variation_group_products`.`group_id` in (620,623,260,627,608,628,410,647,559,354,433,372,642,195,646,571,306,675,305,625,409,547,261,453,562,561,556,364,363,622,621,404,282,552,661,352,564,346,345,418,252,681,155,466,666,353,381,212,266,664,383,648,432,373,382,673,689))",
      "cost_info": {
        "read_cost": "87.76",
        "eval_cost": "21.00",
        "prefix_cost": "108.76",
        "data_read_per_join": "3K"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ]
    }
  }
}