Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '83272c7010089a117291f73516ed895179c37c96be4327b83cb03887fbd27785' 
  AND token = 'bpdh3OjrVlOxpVuBfeWeWtjdZzwaNMp32EuWCpDrKe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00919

JSON explain

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