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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 (
    6018, 6019, 6020, 6196, 6197, 6198, 6199, 
    6200, 6732, 2836, 2837, 2838, 2839, 
    2840, 6422, 6423, 6424, 6425, 2937, 
    2938, 2939, 2940, 2941, 6522, 6523, 
    6524, 6525, 2189, 2190, 2191, 2192, 
    2193, 2194, 2195, 2196, 2197, 2720, 
    2721, 2722, 2723, 2769, 2770, 2771, 
    2772, 2773, 2774, 2775, 2776
  ) 
  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 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}