SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    20473, 20472, 20474, 20475, 20476, 20470, 
    20471, 20417, 20530, 20529, 20418, 
    20277, 20258, 20239, 20240, 20376, 
    20374, 20377, 20381, 20380, 20382, 
    20410, 20383, 20385
  )

Query time 0.00082

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": 24,
      "filtered": 100,
      "index_condition": "cscart_warehouses_sum_products_amount.product_id in (20473,20472,20474,20475,20476,20470,20471,20417,20530,20529,20418,20277,20258,20239,20240,20376,20374,20377,20381,20380,20382,20410,20383,20385)"
    }
  }
}