Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '480bf81690710de797247150c2c16b8af7002d7feff5732b0a5de13fcb031bab' 
  AND token = 'lvMWV+l5YpvQAChzmIys2i7fXdF+5tec4oWKyIa6AuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00823

JSON explain

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