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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 (
    1632, 1633, 1634, 1635, 1636, 1637, 1638, 
    1639, 1640, 1641, 1642, 1643, 1644, 
    1645, 1646, 1647, 1648, 1649, 1650, 
    1651, 1652, 5326, 5327, 5328, 5329, 
    5330, 5331, 5332, 5333, 5334, 5335, 
    5336, 5337, 5338, 5339, 5340, 5341, 
    5342, 5343, 5344, 5345, 5346, 5347, 
    5348, 5349, 5350, 5351, 5352
  ) 
  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"
  }
}