Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f2a8fdbaa70086679e92b6fc9f8890418d8b2aa7d63da6862432c43142bd64' 
  AND token = 'Tsn3OwoiVbZoXQA7HuYjya4x8E/rY9Y/JDjf9kwH/iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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