Jarek - SQL

SELECT value
FROM catalog_product_entity_varchar
WHERE entity_id=(
    SELECT cpet.entity_id
    FROM catalog_product_entity_text cpet
    WHERE cpet.attribute_id=(
        SELECT attribute_id
        FROM eav_attribute
        WHERE attribute_code="normalized_sku"
        AND entity_type_id=(
            SELECT entity_type_id
            FROM eav_entity_type
            WHERE entity_type_code="catalog_product"
            LIMIT 1
        )
        LIMIT 1
    )
    AND cpet.value LIKE "31%"
    LIMIT 1
)
AND attribute_id=(
    SELECT attribute_id
    FROM eav_attribute
    WHERE attribute_code="url_key"
    AND entity_type_id=(
        SELECT entity_type_id
        FROM eav_entity_type
        WHERE entity_type_code="catalog_product"
        LIMIT 1
    )
    LIMIT 1
)
LIMIT 1;