Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3786d04138518afb1e9e3726b136e4a389921a0a014335432ceb0e375ead670c' 
  AND token = 'bW2yvBBBj0KgHLaZeMJaGOvDBESxvbaIXBO52TVOqFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00785

JSON explain

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