SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    4434, 4469, 4470, 4216, 4919, 4729, 18149, 
    4920, 4479, 4489, 4480, 4770, 5084, 
    5085, 4924, 5315, 5446, 5167, 5131, 
    4488, 4936, 5309, 4942, 4943
  )

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_warehouses_sum_products_amount",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 29,
      "filtered": 100,
      "index_condition": "cscart_warehouses_sum_products_amount.product_id in (4434,4469,4470,4216,4919,4729,18149,4920,4479,4489,4480,4770,5084,5085,4924,5315,5446,5167,5131,4488,4936,5309,4942,4943)"
    }
  }
}