SELECT 
  product_id, 
  group_id 
FROM 
  cscart_product_variation_group_products 
WHERE 
  group_id IN (
    433, 364, 363, 404, 434, 405, 380, 381, 
    470, 408, 432, 386, 379, 366, 399, 385, 
    437, 406, 446, 430, 374, 407, 377, 401, 
    436, 402, 384, 400
  )

Query time 0.00089

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "34.91"
    },
    "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": 62,
      "rows_produced_per_join": 62,
      "filtered": "100.00",
      "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_variation_group_products`.`group_id` in (433,364,363,404,434,405,380,381,470,408,432,386,379,366,399,385,437,406,446,430,374,407,377,401,436,402,384,400))",
      "cost_info": {
        "read_cost": "28.71",
        "eval_cost": "6.20",
        "prefix_cost": "34.91",
        "data_read_per_join": "992"
      },
      "used_columns": [
        "product_id",
        "group_id"
      ]
    }
  }
}