SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '49255449e38c93f6da72f4afddefb359dc8b0eb83037f526c58446bcc6875b5d' 
  AND token = '7Fi8NNDB98jEWXfnVGphEl9sVY6SNK4hw3xVxJDvYiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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