<template>
        <lightning-button variant="brand" label="Brand action" title="Brand action"
            onclick={handleClick} class="slds-m-left_x-small"
        ></lightning-button>
    </template>

import { LightningElement } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';

export default class SampleWireContextEventWarning extends NavigationMixin(LightningElement) {
    handleClick(event){
        this[NavigationMixin.Navigate]({
            type: 'standard__recordPage',
            attributes: {
                recordId: "500r0000004QblbAAC",
                objectApiName: "Case",
                actionName: "view"
            },
        });
    }
}