Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03a3c714e3149293864427f69f1311e1af941213d9511cb7d8c6cc8e1a3aeb2' 
  AND token = 'UD+/GdHtpojZklLq2QevQzliQfnSyfkeYP0aNjZRqBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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