Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7e60e783b0cec44377a10f6520da01d5b0018fefc286278a27aae073f99a4195' 
  AND token = 'xE9xm7aMTj8FXISS0hKYi5PpFYwCXNgi5byc07CmQww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00928

JSON explain

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