Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8cbde5ca34619c9b3c800e4218de91b280d409b58ce34ae8705f4a4bdd44bc' 
  AND token = 'O/P7ImbCExC8oVh/3KvRjJ7AfMQ2B1XCeXUra7Ut0SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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