Cook the pasta: Bring a large pot of salted water to a boil. Cook the pasta according to package instructions until al dente. Drain and set aside to cool.
Prepare the vegetables: In a large bowl, combine the corn kernels, cherry tomatoes, red bell pepper, cucumber, and red onion.
Add the cooked pasta: Add the cooled pasta to the bowl with the vegetables and toss to combine.
Make the Mexican Street Corn Dressing: In a small bowl, whisk together the mayonnaise, sour cream, lime juice, cumin, smoked paprika (if using), salt, and pepper. Taste and adjust the seasoning as needed. If desired, add hot sauce to taste.
Combine the dressing and pasta mixture: Pour the Mexican Street Corn Dressing over the pasta and vegetable mixture. Toss to coat everything evenly.
Add the toppings: Sprinkle the chopped cilantro, queso fresco or feta cheese (if using), and scallions (if using) over the top of the pasta salad.
Season with Mexican Street Corn seasoning: Sprinkle the Mexican Street Corn seasoning over the top of the pasta salad and toss to combine.
Serve: Cover the bowl with plastic wrap and refrigerate for at least 30 minutes to allow the flavors to meld. Serve chilled or at room temperature.