SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c3d44b7c402c15e5b0f66953f46a3f2bc87210c86c9a41cd7c29953f3b48c9' 
  AND token = 'W+XHG0jC9Rh5dhEvKm9mhwvTnW0gqf+mWYt6qxtzftM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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