SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80041883f0baf5b540fdcd24d5b964a3562521727c44aabadb573d565279e8cb' 
  AND token = 'Ij5+jsViFhU3BPmCY8QrjhgUyT4ACjDuvo0GzGXYg+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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