Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfe9f6c6177e6a76278e7d496de4a3b5238c9435284ad7cb6ab157712d46536' 
  AND token = 'tNZIk1fTZ7UeCOuNGfOvtqW+mdpisxUqBosrILtnqEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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