Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '21deeb18ae92be933fbe0854cb5b3e73bcd1794b9a077bf4d6939ab36a09e6e3' 
  AND token = '6a0Q8q6XnSIU3lGlOFrA5kWSR42qHZqiC5eSpedLSz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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