Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3c8508253e46de967dc1f99ef7270460436d06587598d97f78d57722ac2612' 
  AND token = 'rkV7kety26aBlVIefC1h/q+VJ65+V9oaWumSbYHtsIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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