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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 (
    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, 2777, 2845, 2846, 
    2847, 2848, 2849, 2850, 2851, 2852, 
    2853, 2854, 2855, 2856, 2857
  ) 
  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 0.00026

JSON explain

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