SELECT 
  cscart_ult_product_prices.product_id, 
  MIN(
    IF(
      cscart_ult_product_prices.percentage_discount = 0, 
      cscart_ult_product_prices.price, 
      cscart_ult_product_prices.price - (
        cscart_ult_product_prices.price * cscart_ult_product_prices.percentage_discount
      )/ 100
    )
  ) AS price 
FROM 
  cscart_ult_product_prices 
WHERE 
  cscart_ult_product_prices.product_id IN (
    148, 149, 242, 243, 134, 135, 156, 154, 
    155, 133, 132, 146, 147, 145, 157, 153, 
    140, 141, 144, 143, 142
  ) 
  AND cscart_ult_product_prices.lower_limit = 1 
  AND cscart_ult_product_prices.company_id = 1 
  AND cscart_ult_product_prices.usergroup_id IN (0, 0, 1) 
GROUP BY 
  cscart_ult_product_prices.product_id

Query time 0.00123

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "60.00"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "table": {
        "table_name": "cscart_ult_product_prices",
        "access_type": "ref",
        "possible_keys": [
          "usergroup",
          "product_id",
          "company_id",
          "lower_limit",
          "usergroup_id"
        ],
        "key": "company_id",
        "used_key_parts": [
          "company_id"
        ],
        "key_length": "4",
        "ref": [
          "const"
        ],
        "rows_examined_per_scan": 240,
        "rows_produced_per_join": 5,
        "filtered": "2.44",
        "index_condition": "(`rajansecarter_single_store_19_jan`.`cscart_ult_product_prices`.`company_id` <=> 1)",
        "cost_info": {
          "read_cost": "12.00",
          "eval_cost": "1.17",
          "prefix_cost": "60.00",
          "data_read_per_join": "187"
        },
        "used_columns": [
          "product_id",
          "price",
          "percentage_discount",
          "lower_limit",
          "company_id",
          "usergroup_id"
        ],
        "attached_condition": "((`rajansecarter_single_store_19_jan`.`cscart_ult_product_prices`.`lower_limit` = 1) and (`rajansecarter_single_store_19_jan`.`cscart_ult_product_prices`.`product_id` in (148,149,242,243,134,135,156,154,155,133,132,146,147,145,157,153,140,141,144,143,142)) and (`rajansecarter_single_store_19_jan`.`cscart_ult_product_prices`.`usergroup_id` in (0,0,1)))"
      }
    }
  }
}