SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65438, 65436, 65439, 65432, 65450, 65451, 
    65433, 65472, 65448, 65434, 65452, 
    65441, 65435, 65476, 65475, 65477, 
    65473, 65956, 65891
  )

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 19,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (65438,65436,65439,65432,65450,65451,65433,65472,65448,65434,65452,65441,65435,65476,65475,65477,65473,65956,65891)"
    }
  }
}

Result