Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bf49ca6d26f3662637e655a507a698430a746c8b7f64056954d84e94ce9ce5' 
  AND token = '1jotz+3HTMdQdUOM/N9yhBAp2F34BRMvDEhqDfnd4wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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