SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7026279365b3420f133e383a0712811d99d55426f6ccea09c60f2ab0f25da8' 
  AND token = 'ts3QquqEawKnlkKFaaqJuYwNs4wMhYblKq5hWvjLupg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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