Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2a85746157a7cdb86d906d5ea8ec03ffcb1450174ab5d2023447d2bc61c4f8' 
  AND token = 'lnNL2TzMy/CQmHXkcnwhHK1hDReXdSXDwIDNJqMjYEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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