Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8336ee17ea1cf4cba1ad608fffc3ca1be30d94a9b28d6bb303b23b55e9345991' 
  AND token = 'imF0+VYewvXO1zmM2QZgaM6ocoKijETdhQy+pwrUFQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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