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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 (
    2345, 2346, 2347, 2348, 2421, 2422, 2423, 
    2424, 2425, 2426, 2427, 2428, 2429, 
    2430, 2431, 2432, 2433, 2434, 2435, 
    2436, 2437, 2438, 2519, 2520, 2521, 
    2522, 2523, 2524, 2525, 2526, 2527, 
    2608, 2609, 2610, 2611, 2612, 2613, 
    2614, 2615, 2616, 5872, 5873, 5874, 
    5875, 5940, 5941, 5942, 5943, 5944, 
    5945, 5946, 5947, 5948, 6021, 6022, 
    6023, 6024, 6025, 6026, 6027, 6028, 
    6029, 6030, 6031, 6032, 6033, 6034, 
    6035, 6036, 6037, 6038, 6111, 6112, 
    6113, 6114, 6115, 6116, 6117, 6118, 
    6119, 6201, 6202, 6203, 6204, 6205, 
    6206, 6207, 6208, 3033, 3034, 3035, 
    3036, 3857, 3858, 3859, 3860
  ) 
  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 0.00030

JSON explain

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