1 files changed, 12 insertions, 0 deletions
diff --git a/django/db/backends/mysql/operations.py b/django/db/backends/mysql/operations.py
index 89730cee29..d5cd374cc5 100644
--- a/django/db/backends/mysql/operations.py
+++ b/django/db/backends/mysql/operations.py
@@ -2,6 +2,7 @@ import uuid
 
 from django.conf import settings
 from django.db.backends.base.operations import BaseDatabaseOperations
+from django.db.models import Exists, ExpressionWrapper, Lookup
 from django.utils import timezone
 from django.utils.encoding import force_str
 
@@ -378,3 +379,14 @@ class DatabaseOperations(BaseDatabaseOperations):
             ):
                 lookup = 'JSON_UNQUOTE(%s)'
         return lookup
+
+    def conditional_expression_supported_in_where_clause(self, expression):
+        # MySQL ignores indexes with boolean fields unless they're compared
+        # directly to a boolean value.
+        if isinstance(expression, (Exists, Lookup)):
+            return True
+        if isinstance(expression, ExpressionWrapper) and expression.conditional:
+            return self.conditional_expression_supported_in_where_clause(expression.expression)
+        if getattr(expression, 'conditional', False):
+            return False
+        return super().conditional_expression_supported_in_where_clause(expression)