SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4c00c0ac0f1c0970716207140be92bad239a8455d215f263ff81e502397cdd' 
  AND token = 'c0KWgdDh3hVJT2jBgWG9DXKolpXj+NpJa8n/+WBagm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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