SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c774a47c28f2fa299f3378c751a52734249d56b94702d9139029061ef8f5c614' 
  AND token = 'lyx0/dutYBMrKKGIFcqLNvvusgkUExczFpsPkBJi268=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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