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SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    795, 792, 787, 786, 782, 819, 781, 765, 
    764, 763, 762, 760, 758, 752, 751, 750, 
    749, 747, 744, 743, 742, 741
  )

Query time 0.00015

JSON explain

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