Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d14f8f04aab045e262e50786a493f852fb08dbb1e8ac1c817a0a1586c77e43' 
  AND token = 'aU38ir7xM+608RQrGa0XeaHuBSYp+WHrehaBvJat/m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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