Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf4fba5c572fa2d77232880f1cdbdd6ecf2b2acf35b89ef60a8ede394f4d0cc' 
  AND token = 'gstZ5Y58k8sKA9Qdo0hTxoV4lviA0/6QWE5Vzk4a1iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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