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SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    1836, 1336, 1837, 1820, 1304, 1738, 1893, 
    1895, 1894, 1641, 1500, 1317, 1670, 
    1658, 1669, 1558, 1644, 1262, 1552, 
    1398, 1595, 1576, 1870, 1691, 1776, 
    1785, 1633, 1563, 1564, 1667, 1786, 
    1945, 1910, 1787, 1308, 1642, 1772, 
    1736, 1277, 1672, 1325, 1665, 1778, 
    1775, 1671, 1649, 1909, 1948
  )

Query time 0.00064

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}