Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1f9f74ba93d1b39337879efba4d8b5508f28a609ac6e30f3969a91c6afc06b57' 
  AND token = 'm44BBLkNqG9c88lVi6ckuTqxR8Y2aRupSke78rQgR7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00771

JSON explain

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