Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eaf325def2e5e5a6b0f8cca46d1614453b7d9112d832e890c39c82612ab3c08' 
  AND token = 'yG+NJgVNMRmxxq7CXbF/7VUas1Sh6+be+iEdrGUldkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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