Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9182b2da5d7dc21f1e740e639569ada3f5c87af0fcdc9d2f2279fff3829209c0' 
  AND token = 'sp5h2O7sLOl/LUsf+EA7/0rGoUZ4dXOrS52mQFw8CjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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