SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716b6770342be299f792603c3e7907e384238da081b601f2a6b55493a28c8dfc' 
  AND token = 'V1lEt+vnR8zYK6XjSZPRi9M8TRVwoFhv8tZ9PlT9DVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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