SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d564b27fa99efcd4ff13b5c3669d31d583a80178aaebd260fdf641237e81823' 
  AND token = 'j0J7jLLgdVGgp++QqldidXYlxQJGxvIUoqM4bVIArqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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