I have no access to a compiler, so there might be errors.

#include <WiFiEsp.h>
#include <MySQL_Connection.h>
#include <MySQL_Cursor.h>

#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2, 3); // RX, TX
#endif

byte mac_addr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

IPAddress server_addr(192,168,x,x);
char user[] = "francis";
char password[] = "xxxxxx";

char ssid[] = "PintoLoco";
char pass[] = "xxxxxxxx";

WiFiEspClient client;
MySQL_Connection conn( (Client *) &client );
MySQL_Cursor *cur_mem = null;

// PPK: some database systems are case sensitive
// so Peceras.Parameters is not the same as peceras.parameters
// check if the tables and fields are named correctly.
char query[] = "SELECT Value FROM Peceras.Parameters";

void setup() 
{
  Serial.begin( 115200 );
  Serial1.begin( 115200 ); 

  Serial.println( "Connecting to WiFi" );
  WiFi.init( &Serial1 );
  int status = WiFi.begin( ssid, pass );
  while( status != WL_CONNECTED )
  {
    status = WiFi.begin(ssid, pass);
  }

  Serial.println( "Connected to network" );
  IPAddress ip = WiFi.localIP();
  Serial.print( "My IP address is: " );
  Serial.println( ip );

  Serial.println( "Connecting DB ..." );
  if ( conn.connect( server_addr, 3306, user, password ) ) 
  {
    Serial.println( "DB connected." );
    cur_mem = new MySQL_Cursor( &conn );
    row_values *row = NULL;
    long head_count = NULL;
    column_names *cols = cur_mem->get_columns();

    cur_mem->execute(query);

    do 
    {
      row = cur_mem->get_next_row();
      if ( row != NULL ) 
      {
        for ( int f = 0; f < cols->num_fields; f++ ) 
        {
          head_count = atoi( row->values[f] );
          Serial.print( "Ingestelde Temperatuur:  ");
          Serial.println( head_count );
          if ( f < cols->num_fields - 1 ) 
          {
            Serial.println(',');
          }
        }
        Serial.println();
      }
    } while (row != NULL);

    // Deleting the cursor also frees up memory used
    // PPK: I'm not sure if this is a good idea, I don't know
    delete cur_mem;
  }
  else
  {
    Serial.println( "DB Connection failed." );
  }
}

void loop() 
{
  // PPK: I would recommend to do the select in the setup section
  // It looks like you want to run it just once
}