Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bad2b0b0f1b4ad78ff55fdf6dee491e1e404d123914abebc7a652728b29208ee' 
  AND token = 'LuorGXsdZIFkf/txIxc7T6kSuy2VzVXp8Y03I54/njM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00802

JSON explain

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