Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '939020ffac21af6f0d895e1ad1330b1dc48f0df718c37991e0da96a2b658d91e' 
  AND token = 'mHXSYS1Dv89C056Uvpy47spCYJB09zYOzAynyXDZ9Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01504

JSON explain

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