SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0269e5f078362d810cd951d2b81679b43264a280e9d5b6299a703af41e8f4b4e' 
  AND token = 'J8sIUTCLcN52YwRcPHLnGxnPnCbzrqeTOXk73Hjk/Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00806

JSON explain

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