Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '104fbdb7578b642db0b37eab01027d9867d8afaf0952205740fbd173a9b7a6f2' 
  AND token = 'AdLm47f5uk98eMiDuTTVedG62ZOguU7krXmvbUF634A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00804

JSON explain

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