Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eed0e8d628afd6e0010993ed1dcb23ac35c91bd7c0f41f009a23fbe9d0697c4' 
  AND token = 'xMQXpY2NXc+EJFpPP5DsW6N3ZwWe4JeQotiUO0CIAB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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