SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a8039f35e8e2f9c754fbd795b8724c5912c3e32243bd986b3029bf1fde62f3' 
  AND token = 'GgmHYX5WvVk5o/C36+7Ww4ep7JvPJ5LoTGmojSkV+/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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