Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6fb5b74b17be5f7cc5709ed1f12135364a5324e7722f40b6f6273a27f872a76e' 
  AND token = 'vkyJoRmdVVuvgl+t3xArNx6YcW1OfJSy1g/eJ3ldQjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00814

JSON explain

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