Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b9b450d0999eaa04988dae84e0f4bc00ac8b8a1c87b25163947845d661640738' 
  AND token = 'vzdaWOlRlE8p36/mXhnU6Z2Lct62huJgQec+X8QMQbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00782

JSON explain

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