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SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    556, 553, 549, 545, 541, 525, 521, 517, 
    513, 507, 497, 492, 489, 486, 482, 455, 
    453, 452, 451, 450, 449, 448, 447, 446, 
    445, 444, 443, 442, 394, 378, 377, 371, 
    369
  )

Query time 0.00015

JSON explain

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