SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3fd58e02fcdf14387f8f93d47cb0c5f5496f9ae36005ddd6ab04cb9fe67fe87c' 
  AND token = 'goK39zirOMPWmhoqk4CDD+Kh6izvKHLTAGb/QQ4rF40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00782

JSON explain

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