Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f1675be7be50da8aac3d0b0df23602bf58d0cbf09031aef1518294e048af67' 
  AND token = 'vxLQVj/0V6xi9UN3jYaFZpsxZKSTlNjsNaYUFUCRHwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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