SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d98decadf1b5bc34c62c52eaa6cda816b42f4fba64587c25d50fd368e6bca6f' 
  AND token = 'VrLKtmvJRl/0PDj/QQvBJvufRrYCvQWRNDynKvd9hPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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