Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5debe17f081f1ec1e4eb34225a8780a7ea4ef265b45e7c0d20308bac1b6bad5' 
  AND token = '+NGhz8u4zpNcBtDq1dxL5U8iZ+tUQdqEMUVd/ditA8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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