Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe38c3ea6e4bdb04b93ffc9dfc088dd1e2b8ddf0d7561e2e954efd19b418ac40' 
  AND token = '/x6H5xBRTBC5ss3fGIQwmaUZogGj9c/CP4qV4DXH8pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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