SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '57a992f09c0a1c77c62cd240934e7863a50d2b05fdf4bbfb429f1813335fa9be' 
  AND token = 'htnYw4Ygq7eAsyydlUUGkFRbjpGdaoJgihKWchS3XuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00737

JSON explain

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