Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86952232223e1de6dc662a4ffb128e7e4cd516feb495f28fa96f99189a7fd35' 
  AND token = 'gPTgmccPPuaTqKAkG1PO7U0z3wM9dXWH7zdGRSSb9TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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