Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe55b6b6ea2d1781c13ebe0ec4d4adbe6ac067f30f5cbef3eddd1feae4e5e03' 
  AND token = 'VJ6aYG+qxBvrRuibWtxShD24Z4waGL8qXZG9JB4emko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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