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 (
    187, 321, 323, 326, 329, 332, 16, 5, 24, 
    170, 1, 22, 149, 227, 78, 79, 190, 189, 
    162, 159, 158, 245, 238, 239, 242, 243, 
    241, 240, 214, 217, 218, 207
  ) 
  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 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "85.21"
    },
    "grouping_operation": {
      "using_filesort": false,
      "table": {
        "table_name": "cscart_product_prices",
        "access_type": "range",
        "possible_keys": [
          "usergroup",
          "product_id",
          "lower_limit",
          "usergroup_id"
        ],
        "key": "product_id",
        "used_key_parts": [
          "product_id"
        ],
        "key_length": "3",
        "rows_examined_per_scan": 38,
        "rows_produced_per_join": 7,
        "filtered": "19.62",
        "index_condition": "(`atulecarter_atul_demo2`.`cscart_product_prices`.`product_id` in (187,321,323,326,329,332,16,5,24,170,1,22,149,227,78,79,190,189,162,159,158,245,238,239,242,243,241,240,214,217,218,207))",
        "cost_info": {
          "read_cost": "83.72",
          "eval_cost": "1.49",
          "prefix_cost": "85.21",
          "data_read_per_join": "178"
        },
        "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`.`usergroup_id` in (0,1)))"
      }
    }
  }
}