SELECT 
  cscart_product_prices.product_id, 
  MIN(
    IF(
      cscart_product_prices.percentage_discount = 0, 
      cscart_product_prices.price, 
      cscart_product_prices.price - (
        cscart_product_prices.price * cscart_product_prices.percentage_discount
      )/ 100
    )
  ) AS price 
FROM 
  cscart_product_prices 
WHERE 
  cscart_product_prices.product_id IN (
    466, 467, 468, 469, 470, 471, 472, 473, 
    474, 475, 476, 477, 478, 479, 480, 481, 
    482, 483, 484, 485, 486, 487, 488, 489, 
    490, 491, 492, 493, 494, 495, 496, 497, 
    498, 499, 500, 501, 502, 503, 504, 505, 
    506, 507, 508, 509, 510, 511, 512, 513, 
    514, 515
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "188.74"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "100.00"
      },
      "table": {
        "table_name": "cscart_product_prices",
        "access_type": "ALL",
        "possible_keys": [
          "usergroup",
          "product_id",
          "lower_limit",
          "usergroup_id"
        ],
        "rows_examined_per_scan": 423,
        "rows_produced_per_join": 100,
        "filtered": "23.64",
        "cost_info": {
          "read_cost": "68.74",
          "eval_cost": "20.00",
          "prefix_cost": "88.74",
          "data_read_per_join": "2K"
        },
        "used_columns": [
          "product_id",
          "price",
          "percentage_discount",
          "lower_limit",
          "usergroup_id"
        ],
        "attached_condition": "((`atulecarter_atul_demo2`.`cscart_product_prices`.`lower_limit` = 1) and (`atulecarter_atul_demo2`.`cscart_product_prices`.`product_id` in (466,467,468,469,470,471,472,473,474,475,476,477,478,479,480,481,482,483,484,485,486,487,488,489,490,491,492,493,494,495,496,497,498,499,500,501,502,503,504,505,506,507,508,509,510,511,512,513,514,515)) and (`atulecarter_atul_demo2`.`cscart_product_prices`.`usergroup_id` in (0,1)))"
      }
    }
  }
}