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 (
    76, 56, 57, 30, 246, 208, 173, 229, 211, 
    210, 209, 67, 25, 213, 215, 226, 154, 
    53, 52, 228, 161, 165, 166, 86, 106, 105, 
    247, 101, 33, 32, 163, 244, 212, 155, 
    55, 69, 206, 184, 183, 133, 132, 125, 
    120, 223, 225, 224, 146, 147
  ) 
  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 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "149.77"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "96.00"
      },
      "table": {
        "table_name": "cscart_product_prices",
        "access_type": "ALL",
        "possible_keys": [
          "usergroup",
          "product_id",
          "lower_limit",
          "usergroup_id"
        ],
        "rows_examined_per_scan": 253,
        "rows_produced_per_join": 95,
        "filtered": "37.94",
        "cost_info": {
          "read_cost": "34.57",
          "eval_cost": "19.20",
          "prefix_cost": "53.77",
          "data_read_per_join": "2K"
        },
        "used_columns": [
          "product_id",
          "price",
          "percentage_discount",
          "lower_limit",
          "usergroup_id"
        ],
        "attached_condition": "((`atulecarter_atul_demo5`.`cscart_product_prices`.`lower_limit` = 1) and (`atulecarter_atul_demo5`.`cscart_product_prices`.`product_id` in (76,56,57,30,246,208,173,229,211,210,209,67,25,213,215,226,154,53,52,228,161,165,166,86,106,105,247,101,33,32,163,244,212,155,55,69,206,184,183,133,132,125,120,223,225,224,146,147)) and (`atulecarter_atul_demo5`.`cscart_product_prices`.`usergroup_id` in (0,1)))"
      }
    }
  }
}